swan's-down

noun
  1. the fine soft down feathers of a swan, used to trim powder puffs, clothes, etc
  2. a thick soft fabric of wool with silk, cotton, or rayon, used for infants' clothing, etc
  3. a cotton fabric with a heavy nap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012